Glossary of Terms

Understand basic Public Safety definitions and terms.

SMSC

Definition:

Short Message Service Center. A network element in the mobile telephone network. Its purpose is to store, forward,
convert and deliver SMS messages.

SSN

Sub‐system Number. Identifies the sub‐system within an SS7 network element.

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GSX / SGX

A Sonus‐specific media gateway that converts a traditional wireline call into a VoIP call. One variant, SGX, converts SS7 signaling.

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A-GPS (Assisted-Global Positioning System)

A-GPS (Assisted-Global Positioning System) is a system that often significantly improves the startup performance—i.e., time-to-first-fix (TTFF)—of a...

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Shape File

A file containing a Geolocation shape(s), such as PSAP shapes or PSAP and cell sector layers.

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